I'm afraid that you regard the size as Euro Size and US Size.please do not follow system size chart !!!
<br />  if you want make a very correct choice you should choose by the size chart at the Second image !!!
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<br />>available:  XS,S,M, L, XL, 
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<br />>ASIA SIZE Shoulder / Chest/ Length / Sleeve
<br />  XS:45cm/49cm/60cm/56cm
<br />S:47cm/50cm/62cm/58cm
<br />M:49cm/53cm/65cm/60cm
<br />L:51cm/55cm/68cm/62cm
<br />XL:53cm/57cm/70cm/64cm